@font-face{font-family:Archivo;font-style:normal;font-display:swap;font-weight:100 900;font-stretch:62% 125%;src:url(/fonts/archivo.woff2)format("woff2-variations")}:root{--spruce:#efe3cc;--spruce-deep:#e4d2b1;--board:#e2c795;--tag:#fbf7ee;--ink:#1e2a44;--ink-soft:#47506a;--rule:#1e2a4433;--rule-strong:#1e2a448c;--red:#c62828;--paint:var(--ink);--font:"Archivo", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;--mono:ui-monospace, "SF Mono", Menlo, Consolas, monospace;--stamp:3px solid var(--ink);--ease:cubic-bezier(.22, 1, .36, 1);--gutter:clamp(16px, 4vw, 40px);--top-gap:clamp(32px, 4.5vw, 64px);color-scheme:light}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scrollbar-color:var(--ink-soft) var(--spruce-deep)}body{background:var(--spruce);min-height:100dvh;color:var(--ink);font:400 1.0625rem/1.6 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var(--red);outline-offset:2px}.head-find-icon{fill:none;width:18px;height:18px;stroke:var(--ink-soft);stroke-width:2px;pointer-events:none;margin-top:-9px;position:absolute;top:50%;left:12px}.head-find input{min-width:0;min-height:0;font:inherit;color:var(--ink);background:0 0;border:0;outline:none;flex:1;padding:0 10px 0 40px;font-size:1rem}.head-find input::placeholder{color:var(--ink-soft);opacity:1}.head-find input::-webkit-search-cancel-button{display:none}.head-find input::-webkit-calendar-picker-indicator{display:none!important}.head-find button{border:0;border-left:2px solid var(--ink);background:var(--ink);color:var(--spruce);font:inherit;text-transform:uppercase;letter-spacing:.04em;cursor:pointer;padding:0 18px;font-size:.95rem;font-weight:800;font-stretch:70%}.head-find button:hover{background:#2a3a5e}.head-menu{margin-left:auto}.head-menu summary,.head-link{text-transform:uppercase;letter-spacing:.06em;cursor:pointer;border-bottom:2px solid #0000;align-items:center;gap:8px;height:44px;font-size:.84rem;font-weight:700;font-stretch:80%;text-decoration:none;list-style:none;display:flex}.head-menu summary::-webkit-details-marker{display:none}.head-menu summary:hover,.head-link:hover,.head-menu[open] summary{border-bottom-color:var(--ink)}.head-menu .bars{display:none}.head-menu summary svg{fill:none;stroke:currentColor;stroke-width:2px;width:12px;height:8px;transition:transform .25s var(--ease)}.head-menu[open] summary .chev{transform:rotate(180deg)}.head-panel{background:var(--tag);border-bottom:var(--stamp);max-height:calc(100dvh - var(--head-h) - 3px);overscroll-behavior:contain;opacity:0;transition:opacity .15s var(--ease), transform .15s var(--ease);margin-top:3px;position:absolute;top:100%;left:0;right:0;overflow-y:auto;transform:translateY(-6px)}.head-menu[open] .head-panel{opacity:1;transition-duration:.2s;transform:none}@starting-style{.head-menu[open] .head-panel{opacity:0;transform:translateY(-6px)}}@supports selector(::details-content){.head-menu::details-content{transition:content-visibility .15s allow-discrete}}.head-panel nav{grid-template-columns:repeat(3,minmax(0,1fr));gap:28px 40px;padding-block:28px 32px;display:grid}.panel-cat{border-bottom:2px solid var(--ink);text-transform:uppercase;align-items:center;gap:10px;padding-bottom:8px;font-size:1.15rem;font-weight:820;font-stretch:68%;line-height:1.1;text-decoration:none;display:flex}.panel-cat:before{content:"";background:var(--paint);flex:none;width:14px;height:14px}.panel-cat:hover{text-decoration:underline}.panel-cat[aria-current]{text-decoration:underline;text-decoration-color:var(--red);text-decoration-thickness:3px}.head-panel ul{columns:2;column-gap:20px;margin:6px 0 0;padding:0;list-style:none}.head-panel li a{break-inside:avoid;padding:5px 0;font-size:.95rem;text-decoration:none;display:block}.head-panel li a:hover{text-decoration:underline}.panel-method{display:none}main{flex:1 0 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a{white-space:nowrap;font-weight:650}@media (pointer:coarse){.grade-list a{margin-block:-9px;padding-block:9px}}.hub{grid-template-columns:minmax(280px,380px) minmax(0,1fr);align-items:start;gap:0 64px;display:grid}.hub-rail{padding-bottom:24px}.hub-head h1{flex-direction:column;gap:18px;margin-bottom:.4em;font-size:clamp(2.5rem,4.4vw,3.6rem);display:flex}.hub-head h1:before{content:"";background:var(--paint);border:3px solid var(--ink);flex:none;width:.7em;height:.9em}.hub-head .lede{margin-bottom:32px;font-size:1.05rem}.hub-count{border-top:2px solid var(--ink);text-transform:uppercase;letter-spacing:.06em;margin:0;padding-top:10px;font-size:.8rem;font-weight:700;font-stretch:80%}.hub-other ul{margin:6px 0 0;padding:0;list-style:none}.hub-other a{border-bottom:1px solid var(--rule);align-items:center;gap:10px;padding:9px 0;font-size:.95rem;text-decoration:none;display:flex}.hub-other a:before{content:"";background:var(--paint);border:2px solid 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span+span{letter-spacing:.06em;text-align:right;align-self:center;font-size:.78rem;font-weight:600;font-stretch:85%}.calc-in .tag-head{background:var(--paint);color:var(--on-paint,var(--ink))}.sheet .tag-head{background:var(--ink);color:var(--spruce)}.calc-fields{grid-template-columns:repeat(3,minmax(0,1fr));gap:6px 16px;padding:20px 18px 16px;display:grid}.field{grid-row:span 3;grid-template-rows:subgrid;min-width:0;margin-bottom:6px;display:grid}.field label{align-self:end}.field[hidden]{display:none}.calc-live .field{transition:opacity .15s var(--ease)}@starting-style{.calc-live .field{opacity:0}}.field.wide{grid-column:1/-1}.field label{font-size:.92rem;font-weight:650;line-height:1.3}.field small{color:var(--ink-soft);font-size:.82rem;line-height:1.4}.input-group{border:2px solid var(--ink);background:#fffdf8;display:flex}.input-group:focus-within{outline:3px solid var(--red);outline-offset:1px}.input-group input,.input-group 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var(--tag)) 0%, var(--spruce) 38%, var(--spruce-deep) 100%)}.gl .viewport:has(.gl-host){aspect-ratio:16/7}.viewport .gl-host{opacity:0;transition:opacity .6s var(--ease);touch-action:pan-y;cursor:grab;position:absolute;inset:0}.viewport .gl-host:active{cursor:grabbing}.viewport.is-3d .gl-host{opacity:1}.diagram{margin:0;padding:12px;transition:opacity .4s}.gl .viewport:has(.gl-host) .diagram{place-items:center;display:grid;position:absolute;inset:0}.viewport.is-3d .diagram{opacity:0;pointer-events:none}.diagram svg{width:100%;max-height:220px;display:block}.dg-top{fill:#f3e7cf;stroke:var(--ink);stroke-width:1.5px}.dg-front{fill:var(--board);stroke:var(--ink);stroke-width:1.5px}.dg-side{fill:#c9a971;stroke:var(--ink);stroke-width:1.5px}.dg-label{font:700 13px 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